Matriark

Hello, this is my first post I don't know much about cars or anything but I'm trying to learn, anyways..

I have a 2016 Audi S3 and when I accelerate (decently ) I hear a loud hissing noise and a loss of power, boost also doesn't seem to be building up like usual, my EPC light came on. when i restarted the car the light went off but still have the hissing sound and loss of power. With the window down it sounds like it's coming from driver side but with the window up I can hear it through the front air vents.

Thanks in advance, lots to learn lol